<div class="test-header" style="height: 5%">
    <label><input type="checkbox" checked onchange="onCbAthlete(this.checked)" />Athlete</label>
    <label><input type="checkbox" checked onchange="onCbAge(this.checked)" />Age</label>
    <label><input type="checkbox" checked onchange="onCbCountry(this.checked)" />Country</label>
</div>
<div id="myGridTop" style="height: 45%"></div>
<div style="height: 5%"></div>
<div id="myGridBottom" style="height: 45%"></div>
